We know that Jack Osbourne has had his ups and downs with weight loss, but it looks like he's back on track to get healthy again.
In fact, Jack is so serious about shedding the pounds, he's resorted to an extreme fitness regimen used by the U.S. Navy Seals!
He was recently seen training at Crossfit Hollywood and doing some heavy duty weight lifting, endurance running, gymnastics and cardio work.
He even posted a pic on Twitter of his cut up hand from the training session.
His new personal trainer has faith in Jack's success. He said:
"Jack is really agile and knows his body well, he picked up the exercises quickly. He should do well at Crossfit."
We certainly hope so, for the sake of his health! Keep it up, Jack.
[Image via WENN.]